Bonn 2010 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 16: Flavourphysik (Theorie) II
T 16.5: Vortrag
Donnerstag, 18. März 2010, 17:45–18:00, HG XIII
Non-leptonic B decays in a supersymmetric GUT model — •Leonardo Vernazza — Institut für Physik (WA THEP), Johannes-Gutenberg-Universität, 55099 Mainz, Germany
Motivated by the search for new physics in non-leptonic B decays, we analyse effects arising in a supersymmetric GUT model elaborated by Chang, Masiero and Murayama. The non-MFV structure of GUT models is interesting, because the large neutrino mixing angles are communicated to the quark sector by the GUT relations, giving rise to a large mixing between the right-handed quarks. Supersymmetry allows this mixing to become physical, thanks to the flavour-changing couplings arising between quarks, squarks and gluinos. The construction of a whole chain of GUTs up to the Plank scale allows to describe the low energy processes in terms of a few fundamental parameters, so that the model is predictive and gives specific signatures and correlations. We analyse non-leptonic decays in view of the constraints arising from the lightest Higgs boson mass and from flavour-changing processes like τ→µγ, b→ sγ and Δ Ms. Once these constraints are taken into account large modifications to the branching ratios are ruled out, but we find that the presence of a new weak phase makes a few observables, like the time-dependent CP asymmetry, rather sensitive to this scenario.